RS232/COM port
Use a Voltronic USB RS232 cable cable plugged into the inverter port labelled "RS232" or "COM".Alternatively you can use the WiFi dongle cable with a USB serial cable You can read more about the communication chips we recommend using here, and the pin configuration below:
| Pin 1 | RX |
| Pin 2 | TX |
| Pin 3 | - |
| Pin 4 | - |
| Pin 5 | - |
| Pin 6 | - |
| Pin 7 | - |
| Pin 8 | GND |
Steps in SolarAssistant
On the configuration page, select "Sumry" as your inverter model.
The cable you plugged in should show up as a USB port:
Click connect:
Parallel installations
With these inverters you will need to connect each inverter with its own cable.
Troubleshooting
If you are missing data for MPPT2, and are running SolarAssistant version 2026-02-26 or later, then please contact the supplier to update the inverter firmware. The Sumry protocol should be able to read MPPT2 data, however, older inverter firmware versions may not support this.